Honeywell M8405 - Manual

PRODUCT DATA
63-2484-2
Solid State Economizer System
(CONSISTING OF: C7046C DISCHARGE AIR SENSOR OR C7150B MIXED AIR SENSOR, C7400A
SOLID STATE ENTHALPY SENSOR OR C7650A SOLID STATE TEMPERATURE SENSOR, M7415
OR M8405 DAMPER ACTUATORS OR MODULATING DIRECT COUPLED ACTUATORS (MS7505),
T6031H THERMOSTAT AND W7459 OR W7212 SOLID STATE ECONOMIZER LOGIC MODULE)
APPLICATION
The Solid State Economizer System provides an economical
method of providing cooling air by incorporating outdoor air in
the first stage of cooling in heating, ventilating and air
conditioning (HVAC) systems. The Solid State Economizer
System consists of the C7046C Discharge Air Sensor or
C7150B Mixed Air Sensor, C7400A Solid State Enthalpy
Sensor or C7650A Solid State Temperature Sensor, M7415
or M8405 Damper Actuators or Modulating Direct Coupled
Actuators (MS7505), T6031H Thermostat and W7212 or
W7459A,C Solid State Economizer Logic Module.
FEATURES
C7046C Discharge Air Sensors have probe lengths of 8 in.
(203 mm) and nominal sensor resistance of 3000 ohms at
77°F (25°C).
• No setting or calibration required.
• Solid state components not affected by dust or dirt.
• Fast reacting.
• Rugged aluminum insertion probe.
C7150B Mixed Air Sensor is used with the W7212/W7459
Economizer Module to sense mixed or discharged air in roof-
top packaged air conditioning equipment.
• No setting or calibration required.
C7400A Solid State Enthalpy Sensor and C7650A Solid State
Temperature Sensors are used with the W7212/W7459 Solid
State Economizer Logic Module to sense outdoor and return
air enthalpy or temperature.
• C7400A senses and combines temperature and
humidity (enthalpy) of outdoor air (heat index).
• C7650A senses temperature only.
• When enthalpy/temperature of outdoor air increases,
the outdoor air damper closes to a preset minimum
position.
• When enthalpy/temperature of outdoor air is low, the
outdoor air damper opens to reduce the building
cooling load.
• Additional economizer savings are achieved when two
C7400A Solid State Enthalpy Sensors are connected to
one Logic Module for differential enthalpy changeover
control.
C7150B
M7415/M8405
C7046C
W7459A,C
C7400A/C7650A
W7212
T6031H
Contents
Application ........................................................................ 1
Features ........................................................................... 1
Ordering Information ........................................................ 2
Specifications ................................................................... 3
Specifications: M7215 ...................................................... 4
Specifications: W7212A Logic Module ............................. 6
Installation: M7215, M7415, M8405 ................................. 7
Wiring: M7215, M7415, M8405 ........................................ 8
Operation and Checkout .................................................. 12
Settings and Adjustments ................................................. 14
Sequence of Operation .................................................... 16
Operation: W7212 ............................................................ 17
Settings and Adjustments: W7212 ................................... 18
Checkout and Troubleshooting ........................................ 19
Checkout and Troubleshooting: W7212 ........................... 31